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Total questions: 66602
What safety rules should be followed in a science laboratory?Popularity: 213
How much does one gallon of salt water weigh?
Popularity: 199
What are the pros and cons of natural gas?
Popularity: 158
Why are the oceans salty?
Popularity: 149
Is Freon an element and if not what is it?
Popularity: 110
How do you remove dye from newspaper?
Popularity: 104
What are the uses of alcohol lamps?
Popularity: 97
How can you find the number of protons and electrons and neutrons in an atom or ion?
Popularity: 93
Can you use muriatic acid to clean out your pipes?
Popularity: 88
What good things does ozone do?
Popularity: 86
What is the importance and impact of chemistry on people society and technology?
Popularity: 80
What is zero degrees Kelvin?
Popularity: 76
Why is snow white and water transparent but sometimes ice can be both?
Popularity: 75
Who was John Dalton and what did he do?
Popularity: 74
How does the elevation and air pressure affect the boiling point of water?
Popularity: 74
Who are some famous foreign chemists and what are their contributions to the field of science?
Popularity: 73
How do you determine if a bond is non-polar covalent or polar covalent or ionic?
Popularity: 72
What is the atomic number and what does it tell you about the number of protons in an atom?
Popularity: 71
What affects the rate of a chemical reaction?
Popularity: 67
What are the names and uses of the various laboratory tools?
Popularity: 66
How do you solve Ideal Gas Law problems?
Popularity: 66
Why haven't chemists created a periodic table of compounds?
Popularity: 63
How many cups are in a quart?
Popularity: 62
How do fireworks work?
Popularity: 62
What is modern periodic law of the elements?
Popularity: 62
What is the metric unit for liquid volume?
Popularity: 62
What are the names and atomic numbers and atomic weights and symbols of all the elements?
Popularity: 61
How do you draw Lewis dot structures?
Popularity: 61
What is air pressure at sea level in all the different units of pressure?
Popularity: 61
What are the vertical columns or families or groups in the periodic table?
Popularity: 60
How do you count the valence electrons of an atom?
Popularity: 60
How did hydrogen obtain its chemical symbol?
Popularity: 60
How do you prepare the sodium perchlorate solution and how will it behave in hydrochloric acid medium?
Popularity: 60
What is plastic made out of?
Popularity: 59
What chemical and molecular effect does sugar have on water?
Popularity: 59
How do you solve all different types of chemistry problems?
Popularity: 59
What is the octet rule in chemistry?
Popularity: 59
How do you determine if a molecule is polar or non-polar?
Popularity: 59
Is baking soda the same as muriatic acid?
Popularity: 58
How do you write a balanced chemical reaction?
Popularity: 58
What does it mean that acids donate hydrogen ions while bases accept them?
Popularity: 58
What are practical uses of calcium?
Popularity: 57
How can the Bohr model of atomic structure be used to explain the reactivity of the alkali metals?
Popularity: 56
How did the element aluminum get its name?
Popularity: 56
How much does a gallon of milk weigh?
Popularity: 56
What is ether?
Popularity: 55
How many valence electrons do each of the elements in the periodic table have?
Popularity: 55
What is the difference between an acid and a base?
Popularity: 55
Why does fire need oxygen?
Popularity: 55
What is electromagnetic radiation?
Popularity: 55
What is the relationship between melting point and atomic radius?
Popularity: 55
What is the Bohr model of the atom?
Popularity: 55
What is the lowest and highest number of shared and unshared atoms in a unit cell of a FCC structure and a simple cubic structure?
Popularity: 55
How do you find the pH of a strong acid solution?
Popularity: 55
Which alkali metal has no known uses?
Popularity: 55
How do you balance a reduction-oxidation or redox reaction?
Popularity: 54
What is the atomic number of copper?
Popularity: 54
Why are elements arranged as they are in the periodic table?
Popularity: 53
What is the atomic number of lithium?
Popularity: 53
What is the atomic number of helium?
Popularity: 52
How do you write a net ionic equation?
Popularity: 52
How does the polarity of water allow it to effectively dissolve ionic compounds?
Popularity: 52
What is the atomic number of aluminum?
Popularity: 52
What is the Lewis dot structure of methane?
Popularity: 51
How do you find the pH of a strong base solution?
Popularity: 51
What are two types of vaporization?
Popularity: 51
How to solve the molality of a solution?
Popularity: 51
How much gasoline is burned in the United Sates each year?
Popularity: 51
What is inside a fire extinguisher?
Popularity: 51
Why does boron form a tripositive ion?
Popularity: 51
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